#include <bits/stdc++.h>
using namespace std;

#define int int64_t
#define endl "\n"

using PII = pair<int, int>;
using TII = tuple<int, int, int>;
template<class T> using V = vector<T>;
using i64 = long long;
using i128 = __int128;
using u64 = unsigned long long;

#define FOR(i, a, b) for (int i = (int)(a); i <= (int)(b); i++)
#define FOR2(i, a, b, c) for (int i = (int)(a); i <= (int)(b); i += c)
#define FORD(i, b, a) for (int i = (int)(a); i >= (int)(b); i--)
#define FORD2(i, b, a, c) for (int i = (int)(a); i >= (int)(b); i -= c)
#define ALL(a) a.begin(), a.end()
#define RALL(a) a.rbegin(), a.rend()
#define lowbit(x) ((x) & (-x))
#define RE return;
#define Yes cout << "Yes" << endl;
#define YES cout << "YES" << endl;
#define No cout << "No" << endl;
#define NO cout << "NO" << endl;
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define sz(x) (int)(x).size()

void solve() {
    int sx, sy, ex, ey;
    cin >> sx >> sy >> ex >> ey;

    string ans;

    int x1 = sx + 1, y1 = sy, x2 = ex, y2 = ey - 1;
    int delx = x2 - x1, dely = y2 - y1;
    ans += 'R';
    FOR(i, 1, delx) ans += 'R';
    FOR(i, 1, dely) ans += 'U';
    ans += 'U';
    x1 = ex + 1, y1 = ey, x2 = sx, y2 = sy - 1;

    delx = abs(x2 - x1), dely = abs(y2 - y1);
    ans += 'R';
    FOR(i, 1, dely) ans += 'D';
    FOR(i, 1, delx) ans += 'L';
    ans += 'U';
    x1 = sx, y1 = sy + 1, x2 = ex - 1, y2 = ey;

    delx = abs(x2 - x1), dely = abs(y2 - y1);
    ans += 'U';
    FOR(i, 1, dely) ans += 'U';
    FOR(i, 1, delx) ans += 'R';
    ans += 'R';
    x1 = ex, y1 = ey + 1, x2 = sx - 1, y2 = sy;

    delx = abs(x2 - x1), dely = abs(y2 - y1);
    ans += 'U';
    FOR(i, 1, delx) ans += 'L';
    FOR(i, 1, dely) ans += 'D';
    ans += 'R';
    cout << ans;
}

signed main() {
    int Task = 1;

    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    while (Task--) {
        solve();
    }

    return 0;
}